source3/libsmb/clisymlink.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  * Client implementation of setting symlinks using reparse points
   4  * Copyright (C) Volker Lendecke 2011
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21 #include "system/filesys.h"
  22 #include "libsmb/libsmb.h"
  23 #include "../lib/util/tevent_ntstatus.h"
  24 #include "async_smb.h"
  25 #include "libsmb/clirap.h"
  26 #include "trans2.h"
  27 #include "libcli/security/secdesc.h"
  28 #include "libcli/security/security.h"
  29 #include "../libcli/smb/smbXcli_base.h"
  30
  31 struct cli_symlink_state {
  32         struct tevent_context *ev;
  33         struct cli_state *cli;
  34         const char *link_target;
  35         const char *newpath;
  36         uint32_t flags;
  37
  38         uint16_t fnum;
  39
  40         uint16_t setup[4];
  41         NTSTATUS set_reparse_status;
  42 };
  43
  44 static void cli_symlink_create_done(struct tevent_req *subreq);
  45 static void cli_symlink_set_reparse_done(struct tevent_req *subreq);
  46 static void cli_symlink_delete_on_close_done(struct tevent_req *subreq);
  47 static void cli_symlink_close_done(struct tevent_req *subreq);
  48
  49 struct tevent_req *cli_symlink_send(TALLOC_CTX *mem_ctx,
  50                                     struct tevent_context *ev,
  51                                     struct cli_state *cli,
  52                                     const char *link_target,
  53                                     const char *newpath,
  54                                     uint32_t flags)
  55 {
  56         struct tevent_req *req, *subreq;
  57         struct cli_symlink_state *state;
  58
  59         req = tevent_req_create(mem_ctx, &state, struct cli_symlink_state);
  60         if (req == NULL) {
  61                 return NULL;
  62         }
  63         state->ev = ev;
  64         state->cli = cli;
  65         state->link_target = link_target;
  66         state->newpath = newpath;
  67         state->flags = flags;
  68
  69         subreq = cli_ntcreate_send(
  70                 state, ev, cli, state->newpath, 0,
  71                 SYNCHRONIZE_ACCESS|DELETE_ACCESS|
  72                 FILE_READ_ATTRIBUTES|FILE_WRITE_ATTRIBUTES,
  73                 FILE_ATTRIBUTE_NORMAL, FILE_SHARE_NONE, FILE_CREATE,
  74                 FILE_OPEN_REPARSE_POINT|FILE_SYNCHRONOUS_IO_NONALERT|
  75                 FILE_NON_DIRECTORY_FILE, 0);
  76         if (tevent_req_nomem(subreq, req)) {
  77                 return tevent_req_post(req, ev);
  78         }
  79         tevent_req_set_callback(subreq, cli_symlink_create_done, req);
  80         return req;
  81 }
  82
  83 static void cli_symlink_create_done(struct tevent_req *subreq)
  84 {
  85         struct tevent_req *req = tevent_req_callback_data(
  86                 subreq, struct tevent_req);
  87         struct cli_symlink_state *state = tevent_req_data(
  88                 req, struct cli_symlink_state);
  89         DATA_BLOB data;
  90         NTSTATUS status;
  91
  92         status = cli_ntcreate_recv(subreq, &state->fnum, NULL);
  93         TALLOC_FREE(subreq);
  94         if (tevent_req_nterror(req, status)) {
  95                 return;
  96         }
  97
  98         if (!symlink_reparse_buffer_marshall(
  99                     state->link_target, NULL, state->flags, state,
 100                     &data.data, &data.length)) {
 101                 tevent_req_oom(req);
 102                 return;
 103         }
 104
 105         if (smbXcli_conn_protocol(state->cli->conn) >= PROTOCOL_SMB2_02) {
 106                 subreq = cli_smb2_set_reparse_point_fnum_send(state,
 107                                                 state->ev,
 108                                                 state->cli,
 109                                                 state->fnum,
 110                                                 data);
 111         } else {
 112                 SIVAL(state->setup, 0, FSCTL_SET_REPARSE_POINT);
 113                 SSVAL(state->setup, 4, state->fnum);
 114                 SCVAL(state->setup, 6, 1); /* IsFcntl */
 115                 SCVAL(state->setup, 7, 0); /* IsFlags */
 116
 117
 118                 subreq = cli_trans_send(state, state->ev, state->cli, 0,
 119                                 SMBnttrans,
 120                                 NULL, -1, /* name, fid */
 121                                 NT_TRANSACT_IOCTL, 0,
 122                                 state->setup, 4, 0, /* setup */
 123                                 NULL, 0, 0,         /* param */
 124                                 data.data, data.length, 0); /* data */
 125         }
 126
 127         if (tevent_req_nomem(subreq, req)) {
 128                 return;
 129         }
 130         tevent_req_set_callback(subreq, cli_symlink_set_reparse_done, req);
 131 }
 132
 133 static void cli_symlink_set_reparse_done(struct tevent_req *subreq)
 134 {
 135         struct tevent_req *req = tevent_req_callback_data(
 136                 subreq, struct tevent_req);
 137         struct cli_symlink_state *state = tevent_req_data(
 138                 req, struct cli_symlink_state);
 139
 140         if (smbXcli_conn_protocol(state->cli->conn) >= PROTOCOL_SMB2_02) {
 141                 state->set_reparse_status =
 142                         cli_smb2_set_reparse_point_fnum_recv(subreq);
 143         } else {
 144                 state->set_reparse_status = cli_trans_recv(
 145                         subreq, NULL, NULL,
 146                         NULL, 0, NULL,  /* rsetup */
 147                         NULL, 0, NULL,  /* rparam */
 148                         NULL, 0, NULL); /* rdata */
 149         }
 150         TALLOC_FREE(subreq);
 151
 152         if (NT_STATUS_IS_OK(state->set_reparse_status)) {
 153                 subreq = cli_close_send(state, state->ev, state->cli,
 154                                         state->fnum);
 155                 if (tevent_req_nomem(subreq, req)) {
 156                         return;
 157                 }
 158                 tevent_req_set_callback(subreq, cli_symlink_close_done, req);
 159                 return;
 160         }
 161         subreq = cli_nt_delete_on_close_send(
 162                 state, state->ev, state->cli, state->fnum, true);
 163         if (tevent_req_nomem(subreq, req)) {
 164                 return;
 165         }
 166         tevent_req_set_callback(subreq, cli_symlink_delete_on_close_done, req);
 167 }
 168
 169 static void cli_symlink_delete_on_close_done(struct tevent_req *subreq)
 170 {
 171         struct tevent_req *req = tevent_req_callback_data(
 172                 subreq, struct tevent_req);
 173         struct cli_symlink_state *state = tevent_req_data(
 174                 req, struct cli_symlink_state);
 175
 176         /*
 177          * Ignore status, we can't do much anyway in case of failure
 178          */
 179
 180         (void)cli_nt_delete_on_close_recv(subreq);
 181         TALLOC_FREE(subreq);
 182
 183         subreq = cli_close_send(state, state->ev, state->cli, state->fnum);
 184         if (tevent_req_nomem(subreq, req)) {
 185                 return;
 186         }
 187         tevent_req_set_callback(subreq, cli_symlink_close_done, req);
 188 }
 189
 190 static void cli_symlink_close_done(struct tevent_req *subreq)
 191 {
 192         struct tevent_req *req = tevent_req_callback_data(
 193                 subreq, struct tevent_req);
 194         struct cli_symlink_state *state = tevent_req_data(
 195                 req, struct cli_symlink_state);
 196         NTSTATUS status;
 197
 198         status = cli_close_recv(subreq);
 199         TALLOC_FREE(subreq);
 200
 201         if (tevent_req_nterror(req, status)) {
 202                 return;
 203         }
 204         if (tevent_req_nterror(req, state->set_reparse_status)) {
 205                 return;
 206         }
 207         tevent_req_done(req);
 208 }
 209
 210 NTSTATUS cli_symlink_recv(struct tevent_req *req)
 211 {
 212         return tevent_req_simple_recv_ntstatus(req);
 213 }
 214
 215 NTSTATUS cli_symlink(struct cli_state *cli, const char *link_target,
 216                      const char *newname, uint32_t flags)
 217 {
 218         TALLOC_CTX *frame = talloc_stackframe();
 219         struct tevent_context *ev;
 220         struct tevent_req *req;
 221         NTSTATUS status = NT_STATUS_NO_MEMORY;
 222
 223         if (smbXcli_conn_has_async_calls(cli->conn)) {
 224                 status = NT_STATUS_INVALID_PARAMETER;
 225                 goto fail;
 226         }
 227         ev = samba_tevent_context_init(frame);
 228         if (ev == NULL) {
 229                 goto fail;
 230         }
 231         req = cli_symlink_send(frame, ev, cli, link_target, newname, flags);
 232         if (req == NULL) {
 233                 goto fail;
 234         }
 235         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 236                 goto fail;
 237         }
 238         status = cli_symlink_recv(req);
 239  fail:
 240         TALLOC_FREE(frame);
 241         return status;
 242 }
 243
 244 struct cli_readlink_state {
 245         struct tevent_context *ev;
 246         struct cli_state *cli;
 247         uint16_t fnum;
 248
 249         uint16_t setup[4];
 250         NTSTATUS get_reparse_status;
 251         uint8_t *data;
 252         uint32_t num_data;
 253 };
 254
 255 static void cli_readlink_opened(struct tevent_req *subreq);
 256 static void cli_readlink_got_reparse_data(struct tevent_req *subreq);
 257 static void cli_readlink_closed(struct tevent_req *subreq);
 258
 259 struct tevent_req *cli_readlink_send(TALLOC_CTX *mem_ctx,
 260                                      struct tevent_context *ev,
 261                                      struct cli_state *cli,
 262                                      const char *fname)
 263 {
 264         struct tevent_req *req, *subreq;
 265         struct cli_readlink_state *state;
 266
 267         req = tevent_req_create(mem_ctx, &state, struct cli_readlink_state);
 268         if (req == NULL) {
 269                 return NULL;
 270         }
 271         state->ev = ev;
 272         state->cli = cli;
 273
 274         subreq = cli_ntcreate_send(
 275                 state, ev, cli, fname, 0, FILE_READ_ATTRIBUTES | FILE_READ_EA,
 276                 0, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
 277                 FILE_OPEN, FILE_OPEN_REPARSE_POINT, 0);
 278         if (tevent_req_nomem(subreq, req)) {
 279                 return tevent_req_post(req, ev);
 280         }
 281         tevent_req_set_callback(subreq, cli_readlink_opened, req);
 282         return req;
 283 }
 284
 285 static void cli_readlink_opened(struct tevent_req *subreq)
 286 {
 287         struct tevent_req *req = tevent_req_callback_data(
 288                 subreq, struct tevent_req);
 289         struct cli_readlink_state *state = tevent_req_data(
 290                 req, struct cli_readlink_state);
 291         NTSTATUS status;
 292
 293         status = cli_ntcreate_recv(subreq, &state->fnum, NULL);
 294         TALLOC_FREE(subreq);
 295         if (tevent_req_nterror(req, status)) {
 296                 return;
 297         }
 298
 299         if (smbXcli_conn_protocol(state->cli->conn) >= PROTOCOL_SMB2_02) {
 300                 subreq = cli_smb2_get_reparse_point_fnum_send(state,
 301                                                 state->ev,
 302                                                 state->cli,
 303                                                 state->fnum);
 304         } else {
 305                 SIVAL(state->setup, 0, FSCTL_GET_REPARSE_POINT);
 306                 SSVAL(state->setup, 4, state->fnum);
 307                 SCVAL(state->setup, 6, 1); /* IsFcntl */
 308                 SCVAL(state->setup, 7, 0); /* IsFlags */
 309
 310                 subreq = cli_trans_send(state, state->ev, state->cli,
 311                                 0, SMBnttrans,
 312                                 NULL, -1, /* name, fid */
 313                                 NT_TRANSACT_IOCTL, 0,
 314                                 state->setup, 4, 0, /* setup */
 315                                 NULL, 0, 0,         /* param */
 316                                 NULL, 0, 16384); /* data */
 317         }
 318
 319         if (tevent_req_nomem(subreq, req)) {
 320                 return;
 321         }
 322         tevent_req_set_callback(subreq, cli_readlink_got_reparse_data, req);
 323 }
 324
 325 static void cli_readlink_got_reparse_data(struct tevent_req *subreq)
 326 {
 327         struct tevent_req *req = tevent_req_callback_data(
 328                 subreq, struct tevent_req);
 329         struct cli_readlink_state *state = tevent_req_data(
 330                 req, struct cli_readlink_state);
 331
 332         if (smbXcli_conn_protocol(state->cli->conn) >= PROTOCOL_SMB2_02) {
 333                 DATA_BLOB recv_data;
 334                 state->get_reparse_status =
 335                         cli_smb2_get_reparse_point_fnum_recv(subreq,
 336                                                         state,
 337                                                         &recv_data);
 338                 if (NT_STATUS_IS_OK(state->get_reparse_status)) {
 339                         state->data = recv_data.data;
 340                         state->num_data = recv_data.length;
 341                 }
 342         } else {
 343                 state->get_reparse_status = cli_trans_recv(
 344                         subreq, state, NULL,
 345                         NULL, 0, NULL,  /* rsetup */
 346                         NULL, 0, NULL,  /* rparam */
 347                         &state->data, 20, &state->num_data); /* rdata */
 348         }
 349         TALLOC_FREE(subreq);
 350
 351         subreq = cli_close_send(state, state->ev, state->cli, state->fnum);
 352         if (tevent_req_nomem(subreq, req)) {
 353                 return;
 354         }
 355         tevent_req_set_callback(subreq, cli_readlink_closed, req);
 356 }
 357
 358 static void cli_readlink_closed(struct tevent_req *subreq)
 359 {
 360         struct tevent_req *req = tevent_req_callback_data(
 361                 subreq, struct tevent_req);
 362         NTSTATUS status;
 363
 364         status = cli_close_recv(subreq);
 365         TALLOC_FREE(subreq);
 366         if (tevent_req_nterror(req, status)) {
 367                 return;
 368         }
 369         tevent_req_done(req);
 370 }
 371
 372 NTSTATUS cli_readlink_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 373                            char **psubstitute_name, char **pprint_name,
 374                            uint32_t *pflags)
 375 {
 376         struct cli_readlink_state *state = tevent_req_data(
 377                 req, struct cli_readlink_state);
 378         NTSTATUS status;
 379         char *substitute_name;
 380         char *print_name;
 381         uint32_t flags;
 382
 383         if (tevent_req_is_nterror(req, &status)) {
 384                 return status;
 385         }
 386
 387         if (!symlink_reparse_buffer_parse(state->data, state->num_data,
 388                                           talloc_tos(), &substitute_name,
 389                                           &print_name, &flags)) {
 390                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 391         }
 392
 393         if (psubstitute_name != NULL) {
 394                 *psubstitute_name = talloc_move(mem_ctx, &substitute_name);
 395         }
 396         TALLOC_FREE(substitute_name);
 397
 398         if (pprint_name != NULL) {
 399                 *pprint_name = talloc_move(mem_ctx, &print_name);
 400         }
 401         TALLOC_FREE(print_name);
 402
 403         if (pflags != NULL) {
 404                 *pflags = flags;
 405         }
 406         return NT_STATUS_OK;
 407 }
 408
 409 NTSTATUS cli_readlink(struct cli_state *cli, const char *fname,
 410                        TALLOC_CTX *mem_ctx, char **psubstitute_name,
 411                       char **pprint_name, uint32_t *pflags)
 412 {
 413         TALLOC_CTX *frame = talloc_stackframe();
 414         struct tevent_context *ev;
 415         struct tevent_req *req;
 416         NTSTATUS status = NT_STATUS_NO_MEMORY;
 417
 418         if (smbXcli_conn_has_async_calls(cli->conn)) {
 419                 status = NT_STATUS_INVALID_PARAMETER;
 420                 goto fail;
 421         }
 422         ev = samba_tevent_context_init(frame);
 423         if (ev == NULL) {
 424                 goto fail;
 425         }
 426         req = cli_readlink_send(frame, ev, cli, fname);
 427         if (req == NULL) {
 428                 goto fail;
 429         }
 430         if (!tevent_req_poll_ntstatus(req, ev, &status)) {
 431                 goto fail;
 432         }
 433         status = cli_readlink_recv(req, mem_ctx, psubstitute_name,
 434                                    pprint_name, pflags);
 435  fail:
 436         TALLOC_FREE(frame);
 437         return status;
 438 }